About a 1/2 hour drive south of the dells is Devils Lake State park. This is a great place to hike and reminds me of a mini Lake Tahoe. Also since your kids are old enough to be on there own for a few hours, there is the Ho-Chunk (5 min south) casino which is a nice place to spend some adult time. For a great burger eat at Monks downtown (not the one by the Wilderness Lodge). Mt Olympus is the place to go as it is a water park (wave pool, slides, lazy river, etc...) theme park with over 7 roller coasters (one was rated in the top 10 wooden roller coasters in the country) and great go cart tracks all included in one price. Last year if you bought one day admitsion you got the next day free. Wisconsin Dells is the waterpark capital of the world so every hotel has a themed area. The big three (Wilderness, Kalahari, and Great Wolf Lodge) have multiple indoor and outdoor parks. However they charge a premium for this. Since you are going during July anyway I would stay at one of the smaller places and do Mt Olympus 1 and 1/2 days and then do Devils Lake 1/2 day then do "downtown" with the Ducks/upper dells boat tour the last day. There is so much to see in the dells that much like disney it takes some planning. Also like disney it can be quite expensive. The Dells.com website has an attraction book you can buy which cost about $80 per person but includes tickets to most of the most popular attractions. Send away for the free visitor guide, do some reserch and have fun.